class Cat:
    def __init__(self, name):
        self.name = name
    @classmethod
    def speak(cls):
        print('shout~~~~~~~')
    def miao(self):
        print('miao~~~~~~~~')

cat=Cat('小白')
print(cat.name)
cat.miao()
# AttributeError: type object 'Cat' has no attribute 'name'
# print(Cat.name) # 实例属性不能用类名访问
# Cat.miao()#TypeError: Cat.miao() missing 1 required positional argument: 'self'
Cat.speak()
